tree e0ac272722a77ece185359add8527bc2c3f9aae6
parent 4e81fe0a5429c103509c8380de8dc7d779f67134
author Jim Stichnoth <stichnot@chromium.org> 1466096568 -0700
committer Jim Stichnoth <stichnot@chromium.org> 1466096568 -0700

Subzero: Build a better bitcast.

The x86 lowering of bitcast between integers and floats forced the transfer through a stack slot (the original implementer *cough* *cough* wasn't aware of the movd instruction).  This requires excess instructions, but also a store to memory followed immediately by a load from that location is very slow.

This fixes the problem by using the movd instruction instead.

BUG= none
R=jpp@chromium.org

Review URL: https://codereview.chromium.org/2077503002 .